关键词: 无线传感器网络，MAC,能量有效，性能分析

Abstract: We presented a controllable threshold polling medium access protocol designed for wireless sensor networks.Although polling as one of kinds the TDMA medium access control protocol has the advantage of energy conservation,extensibility is not as good as that of contention-based protocol. The main goal of the MAC protocol is to realize the self-organizing in slot assignment and synchronization. Methods of the imbedded Markov-chain theory and the probability generating function were used to propose an analysis model of energy efficient for wireless sensor network. Finally, mathematic analyses and simulations results show that the proposed model is suitable for analyzing the energy efficient of MAC for wireless sensor network.

Key words: Wireless sensor network, MAC, Energy efficient, Performance analyses